/*
 * Copyright (C) 2022 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {Component, OnInit} from '@angular/core';
import {ActivatedRoute, Router} from '@angular/router';
import {AlertController, AnimationController} from '@ionic/angular';
import {combineLatest} from 'rxjs';
import {debounceTime, distinctUntilChanged, startWith, take} from 'rxjs/operators';
import {NGXLogger} from 'ngx-logger';
import {SCThings} from '@openstapps/core';

import {DataProvider} from '../../../data/data.provider';
import {DataRoutingService} from '../../../data/data-routing.service';
import {SearchPageComponent} from '../../../data/list/search-page.component';
import {PositionService} from '../../../map/position.service';
import {SettingsProvider} from '../../../settings/settings.provider';
import {FavoritesService} from '../../../favorites/favorites.service';
import {ContextMenuService} from '../../../menu/context/context-menu.service';
import {ConfigProvider} from '../../../config/config.provider';

/**
 * Shows a section with meals of the chosen mensa
 */
@Component({
  selector: 'stapps-favorites-section',
  templateUrl: 'favorites-section.component.html',
  styleUrls: ['favorites-section.component.scss'],
})
export class FavoritesSectionComponent extends SearchPageComponent implements OnInit {
  constructor(
    protected readonly alertController: AlertController,
    protected dataProvider: DataProvider,
    protected readonly contextMenuService: ContextMenuService,
    protected readonly settingsProvider: SettingsProvider,
    protected readonly logger: NGXLogger,
    protected dataRoutingService: DataRoutingService,
    protected router: Router,
    route: ActivatedRoute,
    positionService: PositionService,
    private favoritesService: FavoritesService,
    configProvider: ConfigProvider,
    animationController: AnimationController,
  ) {
    super(
      alertController,
      dataProvider,
      contextMenuService,
      settingsProvider,
      logger,
      dataRoutingService,
      router,
      route,
      positionService,
      configProvider,
      animationController,
    );
  }

  async initialize() {
    this.subscriptions.push(
      combineLatest([
        this.queryTextChanged.pipe(
          debounceTime(this.searchQueryDueTime),
          distinctUntilChanged(),
          startWith(this.queryText),
        ),
        this.favoritesService.favoritesChanged$,
      ]).subscribe(async () => {
        await this.fetchAndUpdateItems();
        this.queryChanged.next();
      }),
    );
  }

  /**
   * Fetches/updates the favorites (search page component's method override)
   */
  async fetchAndUpdateItems() {
    this.favoritesService
      .search(this.queryText, this.filterQuery, this.sortQuery)
      .pipe(take(1))
      .subscribe(result => {
        this.items = new Promise(resolve => {
          resolve(result.data && result.data.filter(item => !this.isMensaThing(item)));
        });
      });
  }

  /**
   * Helper function as 'typeof' is not accessible in HTML
   *
   * @param item TODO
   */
  isMensaThing(item: SCThings): boolean {
    return (
      this.hasCategories(item) &&
      ((item.categories as string[]).includes('canteen') ||
        (item.categories as string[]).includes('cafe') ||
        (item.categories as string[]).includes('student canteen') ||
        (item.categories as string[]).includes('restaurant'))
    );
  }

  /**
   * TODO
   *
   * @param item TODO
   */
  hasCategories(item: SCThings): item is SCThings & {categories: string[]} {
    return typeof (item as {categories: string[]}).categories !== 'undefined';
  }

  /**
   * Emit event that an item was selected
   */
  notifySelect(item: SCThings) {
    this.dataRoutingService.emitChildEvent(item);
  }

  /**
   * Action when user clicked edit to this section
   */
  onSectionEdit() {
    void this.router.navigate(['/search']);
  }
}